FCMify two text-based-repaint tests

LayoutTests/fast/images/repaint-subrect-grid-expected.txt

-(repaint rects
-  (rect -100 -100 18 18)
-  (rect 0 0 18 18)
-  (rect 0 0 18 18)
-  (rect 18 0 19 18)
-  (rect 18 0 19 18)
-  (rect 37 0 18 18)
-  (rect 37 0 18 18)
-  (rect -9 18 18 19)
-  (rect -9 18 18 19)
-  (rect 9 18 18 19)
-  (rect 9 18 18 19)
-  (rect 28 18 18 19)
-  (rect 28 18 18 19)
-  (rect 46 18 18 19)
-  (rect 46 18 18 19)
-  (rect 0 37 18 18)
-  (rect 0 37 18 18)
-  (rect 18 37 19 18)
-  (rect 18 37 19 18)
-  (rect 37 37 18 18)
-  (rect 37 37 18 18)
-  (rect -100 -100 18 18)
+(GraphicsLayer
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (drawsContent 1)
+      (repaint rects
+        (rect 0.00 0.00 18.00 18.00)
+        (rect 0.00 0.00 18.00 18.00)
+        (rect 18.00 0.00 19.00 18.00)
+        (rect 18.00 0.00 19.00 18.00)
+        (rect 37.00 0.00 18.00 18.00)
+        (rect 37.00 0.00 18.00 18.00)
+        (rect 0.00 18.00 9.00 19.00)
+        (rect 0.00 18.00 9.00 19.00)
+        (rect 9.00 18.00 18.00 19.00)
+        (rect 9.00 18.00 18.00 19.00)
+        (rect 28.00 18.00 18.00 19.00)
+        (rect 28.00 18.00 18.00 19.00)
+        (rect 46.00 18.00 18.00 19.00)
+        (rect 46.00 18.00 18.00 19.00)
+        (rect 0.00 37.00 18.00 18.00)
+        (rect 0.00 37.00 18.00 18.00)
+        (rect 18.00 37.00 19.00 18.00)
+        (rect 18.00 37.00 19.00 18.00)
+        (rect 37.00 37.00 18.00 18.00)
+        (rect 37.00 37.00 18.00 18.00)
+      )
+    )
+  )
 )